Ammunition and explosives – Smoke generating
Patent
1991-11-08
1993-08-10
Nelson, Peter A.
Ammunition and explosives
Smoke generating
C06D 300
Patent
active
052339270
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns an arrangement in a smoke camouflage system, preferably for camouflaging and/or screening point targets on fortresses, air parts etc, especially against attacking precisely guided weapons.
The invention especially concerns a device for achieving an effective discharge of screening smoke, especially composition ratios for such smoke and nozzles and driving devices to be used for the most effective multispectral screening.
More specifically, the invention concerns the location of nozzles, trigging such nozzles, and guiding the screening smoke in dependence of meteorological parameters.
DISCLOSURE OF PRIOR ART
EP 0108939 concerns a launching device comprising packed metallic powder in the launching canister itself. The contents of the canister is dispersed through a detonation, and the effect of the powder charge comprising lamellated powder, will be reduced because the spreading rate is less for pure metallic powder alone.
It is true that EP 0108939 specifies that the exhaust gasses from the fuel for the launching canisters aids in blowing out the metallic powder, but such a spontaneous blowout can not be compared to continuous blowout from a pressure nozzle, as is the case with the present invention.
NO 58.725 concerns a process for producing smoke over sea, on land or in the air, and specifies a pure liquid being mixed with ambient air giving rise to smoke, something which is without interest in connection with nozzle-spreading of "cold-flowing" metallic powder for IR-screening and metal fibre/dipoles for mm-wave-screening.
NO 59.443 concerns a process for developing smoke by using a smoke-producing liquid, and represents a further development of the above mentioned NO patent 58.725, but gives no further information about the pure liquid which is to be mixed with the ambient air other than this being added colouring powder. The technique relating to this patent is thus scarcely suited for metallic particles, and nothing is specified about the production of a good "cold-flowing" powder composition.
GB 2000575 specifies a metal pressure cylinder expelling a metal powder composition, more specifically micro-fine powder with a particle diameter from 3 to 60 .mu.m for estabishing a fog-like cloud for covering a target visually. The suggested powder is talc, caolin, potassium carbonate, magnesium carbonate, sodium hydrogen carbonates and other free-flowing powders or powders which have been made flowable, and which may produce a hanging cloud when being spread. However, there is not given any specification of the problems concerning the expelling of metallic powders, metallic particles not being mentioned at all, and even less the publication specifies metallic particles or dipoles being equipped with a suitable carrier, e.g. a sand-blowing composition which in its turn produces a "cold-flowing" composition giving the advantages being specified for the present invention.
Admittedly, there is suggested a pressure cylinder and a kind of "environmentally friendly" powder which after use fertilizes the ground, but there is no specification concerning nozzle-spreading of metallic powder for IR-screening (3-12 .mu.m) and metallic fibres/dipoles for mm-wave screening (35-94 GHz) being blown through nozzles by using high-pressure air and with a simple automatical or manual dosing.
DE 3714454 specifies a two-component fog, especially comprising silicon tetrachloride and an ammonia-solution being suited for smoke-coverage rehersals and giving a purely visual protection. However, neither does this publication give any specification about how one may suitable discharge a powder charge which has added thereto a suitable filler by using high-pressure nozzles to produce a disperse composition of metallic powder for IR-screening and metallic fibres/dipoles for mm-wave screening. The known system is based on the production of a fog by liquids being misted through a stream of pressurized air, and this pressure is far less than what is needed for the present invention where
REFERENCES:
International Search Report.
International Preliminary Examination Report.
Nelson Peter A.
Raufoss A/S
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